Ross County booked their place in the last 16 of the William Hill Scottish Cup with a glut of goals against fourth round opponents Dundee United at Global Energy Stadium.

A hectic first half produced six goals, four of them to County, and despite a gallant second round performance from the Championship side, County finished strongly to seal their place in the next round.

County took the lead in spectacular style in the sixth minute when a Martin Woods corner fell for the unmarked Christopher Routis who fired an unstoppable shot high into the net from just inside the 18-yard box.

It was all-square in the 14th minute, though, when Tope Obadeyi drove into the box and cut the ball back for Tony Andreu, who volleyed past County goalkeeper Scott Fox.

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It only took a couple of minutes for County to restore their lead. They won a free kick on the edge of the area after Charlie Telfer was booked for a foul on Ryan Dow. Alex Schalk's powerful shot was blocked by United keeper Cammy Bell but Paul Quinn was on hand to head in from close range.

County made it 3-1 in the 28th minute when Routis got to the bye-line and his chip into the box was Tim Chow slotted the ball away from six yards. The home side opened up a three goal lead when Woods played the ball out to Boyce and he cut inside and fired a low drive into the far corner of the net.